﻿using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace 易保全
{
    public partial class LabelTx : Label
    {
        //public System.Windows.Forms.AutoScaleMode AutoScaleMode {get;set;} 
        public LabelTx()
        {
            InitializeComponent();
        }
        public LabelTx(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }
        int lineDistance = 5;//行间距
        public int LineDistance
        {
            get { return lineDistance; }
            set { lineDistance = value; }
        }

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            String drawString = this.Text;
            Font drawFont = this.Font;
            SolidBrush drawBrush = new SolidBrush(this.ForeColor);

            //int lineCount = 0;
            
            //SizeF textSize = new SizeF();
            ////自定义换行符 =#
            //string[] textArr = this.Text.Split('#');
            //for (int i = 0; i < textArr.Length; i++)
            //{
            //    textSize = g.MeasureString(textArr[i], this.Font);//文本的矩形区域大小
            //    lineCount += Convert.ToInt16(textSize.Width / this.Width) + 1;//计算行数
            //    if (i > 0)
            //        this.Height += Convert.ToInt16((textSize.Height + lineDistance) * lineCount);//计算调整后的高度
            //    else
            //        this.Height = Convert.ToInt16((textSize.Height + lineDistance) * lineCount);//计算调整后的高度
            //}

            SizeF textSize = g.MeasureString(this.Text, this.Font);//文本的矩形区域大小
            int lineCount = Convert.ToInt16(textSize.Width / this.Width) + 1;//计算行数
            this.Height = Convert.ToInt16((textSize.Height + lineDistance) * lineCount);//计算调整后的高度
            this.AutoSize = false;
            float x = 0.0F;
            //float y = 0.0F;
            StringFormat drawFormat = new StringFormat();
            int step = 1;
            lineCount = drawString.Length;//行数不超过总字符数目
            for (int i = 0; i < lineCount; i++)
            {
                //计算每行容纳的字符数目
                int charCount;
                for (charCount = 0; charCount < drawString.Length; charCount++)
                {
                    string subN = drawString.Substring(0, charCount);
                    string subN1 = drawString.Substring(0, charCount + 1);
                    if (g.MeasureString(subN, this.Font).Width <= this.Width
                        && g.MeasureString(subN1, this.Font).Width > this.Width)
                    {
                        step = charCount;
                        break;
                    }
                }
                string subStr;
                if (charCount == drawString.Length)//最后一行文本
                {
                    subStr = drawString;
                    e.Graphics.DrawString(subStr, drawFont, drawBrush, x, Convert.ToInt16(textSize.Height * i) + i * LineDistance, drawFormat);
                    break;
                }
                else
                {
                    subStr = drawString.Substring(0, step);//当前行文本
                    drawString = drawString.Substring(step);//剩余文本
                    e.Graphics.DrawString(subStr, drawFont, drawBrush, x, Convert.ToInt16(textSize.Height * i) + i * LineDistance, drawFormat);
                }
            }
        }
    }
}